Re: [Discuss-gnuradio] wx gui FFT sink missing peaks

[Marcus D. Leech]

On 08/30/2013 12:01 PM, Nemanja Savic wrote:

Hi all,

i am for a long time experiencing (possible) problem with wx gui FFT sink. Namely, i have receiver implemented in usrp1 and transmitter which sends signal regularly every minute. I receive corect packets and everything, but the problem is i can't see the spectrum of the received signal. I selected option peak hold, and peak is catched very rarely.

Is this problem with parameters setup or some kind of malfunction of this block?

Thanks,

--
Nemanja Savić

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If your transmission is very short, the FFT may not catch it.  The FFT display in Gnu Radio does a fair amount of decimation-by-windows, which means
  that it throws away a lot of the time-domain "chunks" that would otherwise be processed, in order to attain the desired display-rate.

-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org